I bought my 13" 2.4Ghz Macbook Pro 2010 a couple of weeks ago. Yaay~! Until I started playing World of Warcraft on it with a LG 21.5" monitor external display connected using DVI on 1600x1200 resolution. After 0.5 hr or so, the graphics starts getting distorted. Toolbars, NPC names, damages, my char's cloak started showing cubes. After exiting the game, the MAC OS desktop also show the same graphics problem. It happened constantly every night i played. Last night I tried playing on the 13" MBP monitor without the external display, it did not seem to have any problems for the entire night. What is the problem and what should i do?